The real answer: making money on the App Store is extremely difficult. Developers have worked out subscriptions make more money than one-off purchases over time, even if a large % of people will refuse to engage with them.
There are fashion subscriptions. Some people do not value being able to continually rewear clothes and would prefer to constantly having new clothes to show off.
That's absurd. I've gotten value from my toilet plunger for years. Let me start charging you a toilet plunger subscription just for privilege of using it when you please. That's your logic.